Abstract
Magnetic measurements and Mössbauer spectroscopy revealed two types of spin reorientation in DyFe 0.9975Co 0.0025O 3 in the temperature range 77–300 K. The higher temperature transition was a continuous rotation of Fe 3+ spins from the a to the c axes of the single crystal in the region 260-145 K. The lower temperature transition was from a weakly ferromagnetic to the purely antiferromagnetic state. A peculiarity was observed with both methods. When the Fe 3+ spins, turning from the a towards the c axis, form an angle of about 20° with the latter, they do not proceed to reach c, but jump to the b axis and the crystal becomes a pure antiferromagnet. An external magnetic field of 10 kOe, H ext c, does not change this reorientation pattern, but a smaller field along a completes the reorientation along the c axis. Mössbauer spectra indicate two hyperfine fields during the continuous spin reorientation.
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